From a5e3e2d134ca7a44741240bfef1153e2e9a5c85d Mon Sep 17 00:00:00 2001
From: Bill Nottingham <notting@redhat.com>
Date: Wed, 10 Sep 2003 02:33:02 +0000
Subject: add uli's hostid setting program

---
 src/Makefile    |  4 +++-
 src/genhostid.1 | 12 ++++++++++++
 src/genhostid.c | 32 ++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+), 1 deletion(-)
 create mode 100644 src/genhostid.1
 create mode 100644 src/genhostid.c

(limited to 'src')

diff --git a/src/Makefile b/src/Makefile
index 4281da0e..ac8b8028 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,7 +1,7 @@
 CFLAGS+=$(RPM_OPT_FLAGS) -Wall -D_GNU_SOURCE
 
 PROGS=usernetctl doexec netreport testd usleep ipcalc initlog minilogd \
-	getkey ppp-watch consoletype redhat-support-check
+	getkey ppp-watch consoletype redhat-support-check genhostid
 PPPWATCH_OBJS=ppp-watch.o shvar.o
 INITLOG_OBJS=initlog.o process.o
 USLEEP_OBJS=usleep.o
@@ -20,12 +20,14 @@ install:
 	install -m 4755 usernetctl $(ROOT)/usr/sbin/usernetctl
 	install -m 2755 netreport $(ROOT)/sbin/netreport
 	install -m 755 ipcalc $(ROOT)/bin/ipcalc
+	install -m 755 genhostid $(ROOT)/sbin/genhostid
 	install -m 755 initlog $(ROOT)/sbin/initlog
 	install -m 755 minilogd $(ROOT)/sbin/minilogd
 	install -m 755 getkey $(ROOT)/sbin/getkey
 	install -m 755 ppp-watch $(ROOT)/sbin/ppp-watch
 	install -m 755 consoletype $(ROOT)/sbin/consoletype
 	install -m 644 initlog.1 $(ROOT)$(mandir)/man1
+	install -m 644 genhostid.1 $(ROOT)$(mandir)/man1
 	install -m 644 doexec.1 $(ROOT)$(mandir)/man1
 	install -m 644 netreport.1 $(ROOT)$(mandir)/man1
 	install -m 644 usleep.1 $(ROOT)$(mandir)/man1
diff --git a/src/genhostid.1 b/src/genhostid.1
new file mode 100644
index 00000000..436d9537
--- /dev/null
+++ b/src/genhostid.1
@@ -0,0 +1,12 @@
+.TH GENHOSTID 1
+.SH NAME
+genhostid \- generate and set a hostid for the current host
+.SH SYNOPSIS
+.B genhostid
+
+.SH DESCRIPTION
+\fBgenhostid\fR generates a random hostid and stores it in /etc/hostid,
+if /etc/hostid does not already exist.
+
+.SH "SEE ALSO"
+hostid(1), gethostid(2), sethostid(2)
diff --git a/src/genhostid.c b/src/genhostid.c
new file mode 100644
index 00000000..a56cad83
--- /dev/null
+++ b/src/genhostid.c
@@ -0,0 +1,32 @@
+/* Copyright (C) 2003 Red Hat, Inc.
+ *
+ * This software may be freely redistributed under the terms of the GNU
+ * public license.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *         
+ */
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+#include <sys/stat.h>
+int
+main (void)
+{
+  struct stat st;
+  long int n;
+  if (stat ("/etc/hostid", &st) == 0 && S_ISREG (st.st_mode)
+      && st.st_size >= sizeof (n))
+    return 0;
+  int fd = open ("/dev/random", O_RDONLY);
+  if (fd == -1 || read (fd, &n, sizeof (n)) != sizeof (n))
+    {
+      srand48 ((long int) time (NULL) ^ (long int) getpid ());
+      n = lrand48 ();
+    }
+  return sethostid (n);
+}
-- 
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